+ 7 (I think that's what we're up to) on you can, and often should, shift in a sprint.
This is the reason that STI was a significant deal to racers.
It's also the reason that SRAM shifters are designed so that you can pull the shifter in close to the bars, independent of the brake lever.
(allowing easy shifts in the drops in a sprint)
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.